I had my open brains on the bottom of my tank one was near the left side, then center, then the right side. My flow from the return pump hits the left glass wall first then travels down to the SB. My return pump is a quietones 6000 and the tank is 36"hx30"wx20"d so I figure there might be around 850 gph actually making out of the locline fittings. The first lob on the left side would not inflate, sitting with the edges of its skeleton revealed. The second and third looked better, inflated all the time. So I played with their locations and the direction of flow in the tank and found a happy ,edium for everything. Now there is little flow moving over the lob's and trach's and they are fully inflated and gorgeous!
I'll post some pictures for you so you can see the difference it made in my corals!
Cheers